The trivalent influenza vaccine prepared for the 2005-2006 season will include A/New Caledonia/20/99 (H1N1)-like virus; A/California/7/2003 (H3N2)-like virus; and B/Shanghai/361/2002-like virus. Vaccines produced for the 2004-2005 season are now past their expiration dates. It is recommended that vaccine not be used beyond the labeled expiration date.